OBIEE DAC with Maestro Workload Scheduler issue

We are currently using OBIEE 10g and upgrading to 11G. We use Tivoli Workload Scheduler with a unix script to run our DAC execution plans. In 11G for some reason when we run a Maestro job, it runs the DAC execution plan twice, one right after another. In 10G we don't have this issue. We are using the same script with 10G and 11G. Has anyone seen this issue. When we run from the DAC command it only runs once but in Maestro it runs twice each time. No issue in 10g. Thanks

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